<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="../css/reset.css">
    <style>
        ul li {
            float: left;
            margin-left: 40px;
        }

        /* 除最后一个以外 */
        ul li+li {
            color: red;
            border-left: 1px solid #000;
            padding-left: 40px;
        }

        /* 除最后一个以外 */
        ul li~li {
            color: brown;
        }
    </style>
</head>

<body>

    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
    </ul>

</body>

</html>